where, \(\chi \)  is a constant and its value depends on the initial conditions. For exit from the antipodal point, the cavity center and uniformly distributed initial positions within the cavity, the approximate values of \(\chi \)  are \( 2\ln 2 \) , \( \ln 2 + 1/4\)  and \( \ln 2 + 1/8\) , respectively [1]}. As expected, the exit time is insensitive to the orientation of self-propulsion velocity at the starting point. Further to note, for \(D_0 \rightarrow 0\) , Eq. (REF ) collaborates finding in Refs. [2]}, [3]}.
